Candidates (O)

James Louis Oberstar

• 1974 – Minnesota’s 8th congressional district (DFL) – won
• 1976 – Minnesota’s 8th congressional district (DFL) – won
• 1978 – Minnesota’s 8th congressional district (DFL) – won
• 1980 – Minnesota’s 8th congressional district (DFL) – won
• 1982 – Minnesota’s 8th congressional district (DFL) – won
• 1984 – Minnesota’s 8th congressional district (DFL) – won
• 1986 – Minnesota’s 8th congressional district (DFL) – won
• 1988 – Minnesota’s 8th congressional district (DFL) – won
• 1990 – Minnesota’s 8th congressional district (DFL) – won
• 1992 – Minnesota’s 8th congressional district (DFL) – won
• 1994 – Minnesota’s 8th congressional district (DFL) – won
• 1996 – Minnesota’s 8th congressional district (DFL) – won
• 1998 – Minnesota’s 8th congressional district (DFL) – won
• 2000 – Minnesota’s 8th congressional district (DFL) – won
• 2002 – Minnesota’s 8th congressional district (DFL) – won
• 2004 – Minnesota’s 8th congressional district (DFL) – won
• 2006 – Minnesota’s 8th congressional district (DFL) – won
• 2008 – Minnesota’s 8th congressional district (DFL) – won
• 2010 – Minnesota’s 8th congressional district (DFL) – lost

Walter E. Obert

• 1946 – Ohio’s 20th congressional district (R) – lost

James D. Oberweis

• 2008 – Illinois’ 14th congressional district (R) – lost
• 2014 – United States Senate (Illinois) (R) – lost

Jim Oberweis

• 2020 – Illinois’ 14th congressional district (R) – lost

David Ross Obey

• 1970 – Wisconsin’s 7th congressional district (D) – won
• 1972 – Wisconsin’s 7th congressional district (D) – won
• 1974 – Wisconsin’s 7th congressional district (D) – won
• 1976 – Wisconsin’s 7th congressional district (D) – won
• 1978 – Wisconsin’s 7th congressional district (D) – won
• 1980 – Wisconsin’s 7th congressional district (D) – won
• 1982 – Wisconsin’s 7th congressional district (D) – won
• 1984 – Wisconsin’s 7th congressional district (D) – won
• 1986 – Wisconsin’s 7th congressional district (D) – won
• 1988 – Wisconsin’s 7th congressional district (D) – won
• 1990 – Wisconsin’s 7th congressional district (D) – won
• 1992 – Wisconsin’s 7th congressional district (D) – won
• 1994 – Wisconsin’s 7th congressional district (D) – won
• 1996 – Wisconsin’s 7th congressional district (D) – won
• 1998 – Wisconsin’s 7th congressional district (D) – won
• 2000 – Wisconsin’s 7th congressional district (D) – won
• 2002 – Wisconsin’s 7th congressional district (D) – won
• 2004 – Wisconsin’s 7th congressional district (D) – won
• 2006 – Wisconsin’s 7th congressional district (D) – won
• 2008 – Wisconsin’s 7th congressional district (D) – won

Fred A. Obley

• 1960 – Pennsylvania’s 25th congressional district (R) – lost

Harry A. Obold

• 1940 – Pennsylvania’s 14th congressional district (I) – lost

Steve Obsitnik

• 2012 – Connecticut’s 4th congressional district (R) – lost

Oliver Ocasek

• 1962 – Ohio’s 14th congressional district (D) – lost
• 1968 – Ohio’s 14th congressional district (D) – lost

Alexandria Ocasio-Cortez

• 2018 – New York’s 14th congressional district (D) – won
• 2020 – New York’s 14th congressional district (D, WF) – won
• 2022 – New York’s 14th congressional district (D) – won

Javier Ocasio

• 2016 – Hawaii’s 1st congressional district (Special) (D) – lost

Frank J. Occhiogrosso

• 1970 – New York’s 10th congressional district (R, CON) – lost

John Oceguera

• 2012 – Nevada’s 3rd congressional district (D) – lost

Edmund W. Ochenkowski

• 1970 – Illinois’ 5th congressional district (R) – lost

Gloria Ochoa

• 1992 – California’s 22nd congressional district (D) – lost

Henry A. Ochsner

• 1942 – Wisconsin’s 3rd congressional district (S) – lost

Alonzo Odam

• 1940 – New Jersey’s 10th congressional district (S) – lost

Bob Odden

• 2000 – Minnesota’s 3rd congressional district (L) – lost

Arthur E. Oddie

• 1934 – Connecticut’s 2nd congressional district (S) – lost

Tasker Lowndes Oddie

• 1920 – United States Senate (Nevada) (R) – won
• 1926 – United States Senate (Nevada) (R) – won
• 1932 – United States Senate (Nevada) (R) – lost
• 1938 – United States Senate (Nevada) (R) – lost

Joseph P. Oddo

• 2004 – Virginia’s 11th congressional district (I) – lost
• 2006 – Virginia’s 5th congressional district (IG) – lost
• 2008 – Virginia’s 11th congressional district (IG) – lost
• 2022 – South Carolina’s 1st congressional district (Alliance) – lost

Salvatore E. Oddo

• 1974 – Illinois’ 8th congressional district (R) – lost

Elma D. Oddstad

• 1958 – California’s 9th congressional district (D) – lost

Robert J. Odegard

• 1962 – Minnesota’s 6th congressional district (R) – lost
• 1964 – Minnesota’s 6th congressional district (R) – lost

Fred T. Odell

• 1958 – Washington’s 4th congressional district (C) – lost

Michael R. Odell

• 2000 – Missouri’s 2nd congressional district (G) – lost

Richard Wayne Odell

• 2002 – Nevada’s 3rd congressional district (IA) – lost

Tracy Odell

• 1966 – California’s 32nd congressional district (D) – lost

Ron Oden

• 2000 – California’s 44th congressional district (D) – lost

Kurt Odenheim

• 1936 – New Jersey’s 12th congressional district (Comm.) – lost

Henry A. Oder, Jr.

• 1958 – Virginia’s 7th congressional district (I) – lost

Reno Odlin

• 1934 – United States Senate (Washington) (R) – lost

Jacqueline Cochran Odlum

• 1956 – California’s 29th congressional district (R) – lost

Robert Odman

• 1958 – Washington’s 1st congressional district (D) – lost

(Mrs.) Christine P. Odom

• 1954 – North Carolina’s 3rd congressional district (R) – lost

Archie Odom

• 1966 – South Carolina’s 6th congressional district (R) – lost

Ben Odom

• 1998 – Oklahoma’s 4th congressional district (D) – lost

Gary R. Odom

• 1990 – California’s 37th congressional district (AI) – lost
• 1992 – California’s 43rd congressional district (AI) – lost

Harry C. Odum

• 1942 – Illinois’ 22nd congressional district (D) – lost

John A. Oebbecke

• 1942 – Pennsylvania’s 4th congressional district (Social Reconstruction) – lost

David Oenbring

• 2000 – Nebraska’s 1st congressional district (L) – lost

Gus Oertling

• 1926 – Louisiana’s 1st congressional district (R) – lost

Bristol Oesch

• 1948 – Indiana’s 3rd congressional district (Proh.) – lost

William Oesch

• 1946 – Indiana’s 3rd congressional district (Proh.) – lost

Jacob M. Offenhender

• 1940 – New York’s 8th congressional district (R) – lost

Charles B. Officer

• 1964 – New Hampshire’s 2nd congressional district (D) – lost
• 1972 – New Hampshire’s 2nd congressional district (D) – lost

Paul Offner

• 1982 – Wisconsin’s 3rd congressional district (D) – lost

Larry Oftedahl

• 2004 – Wisconsin’s 7th congressional district (C) – lost

Harmon T. Ogdahl

• 1968 – Minnesota’s 5th congressional district (R) – lost

Alan Robert Ogden

• 1974 – Virginia’s 3rd congressional district (I) – lost
• 1976 – Virginia’s 3rd congressional district (I) – lost
• 1978 – Virginia’s 3rd congressional district (I) – lost
• 1992 – Virginia’s 10th congressional district (I) – lost
• 1994 – Virginia’s 10th congressional district (I) – lost